Refrigerating apparatus



Jan. 28, 1930. e. M. TRouP 1,744,816

REFRIGERATING APPARATUS Filed Nov. 18, 1926 T l Compressor V Receiver gwuen iod attozmug Patented Jan. 28, 1930 UNITED STATES PATENT OFFICE GEORGE M. TROUT, OF DAYTON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO I IRIGIDAIRE CORPORATION, A. CORIOBATION OF DELAWARE Barnrenaarme ar'ranarus Application flled'november 18, 1926. Serial No. 149,111.

This invention relates to refrigerating apparatus particularly to household plants of the compressor-condenser-expander typei One of its objects is-generally to improve the operation of such plants by preventing excessive head pressure on the compressor. ,4 Other objects will be apparent from the accompanying description and drawings whichshow diagrammatically a refrigerating system embodying one form of my invention.

The system includes a. conventional comressor 10 driven by an electric motor 11,-

rawing gaseous refrigerant from an evaporator 12 and delivering it in compressed gaseous form to a condenser, generally denoted b 13, cooled by air currents produced by tlie fan 14. The refrigerant condenses to liquid and flows into receiver 15.. Thepres sure built up by the compressor forces the liquid refrigerant up into the evaporator 12.

The motor is automatically started or stopped in response to conditions in the system by a pressure-responsive switch 16. In systems 2 of this character, the-compressor may be lubricated b the familiar splash system, o'il.

beingplace in the crank case for this purpose. Some oil leaks past the piston and-is pumped into the condenser and thus a certain amount is circulated through the system.

There are times, particularly when the compressor is started by the automatic control apparatus, when abnormally large quantities piping which may stall the motor,- .or even strain or break the connections. In order to prevent oil or other liquid coming from the compressor stopping the condenser passages, I arrange two passages in arallel between the compressor and receiver in such a manner that liquid can not flow throu h one of them. This, then is always open or the passage of gaseous refrigerant I and conse uently an excessive pressure can not beqbuidt up. The other passage is ar- 'ranged to permit the oil toflow through it,

as well as refrigerant. f v

. One mode of accomplishing this is to connect an oil trap 20 to thecompressor delivery pipe 21' andv connect two condenser coils 22 and 23 in parallel between the trap and a common pipe 24 leading to the receiver. The delivery pipe from the compressor may enter the trap at any suitable point, which may be,

as shown, near the top. The connection to the coil 23 is near the top of the trap while the connection bottom.

Gaseous refrigerant and liquid enterin the trap will separate, the liquid flowing 0 through coil 22. It will be appreciated that the quantity of oil circulated is small, therefore there will be no constant level of oil in the trap, and bothrefrigerantand oil may to coil 22 is at or near the ordinarily flow through coil 22. The trap ;has sufiicient'capacity to hold, below the level of the connection to 23, all the oilwhich is likely to be delivered suddenly by the comre ssor. This oil can drain gradually through 22, leaving the coil 23 always unobstructed for the flow of gaseous refrigerant. The oil circulates through the system, returning through the evaporator to lubricate the compressor. q

. It is to be understood that the invention is not limited 'to the particular details which have been selected for the sake of illustion merely but includes modifications with in the scope of the appended claims.

vWhat is claimed is as follows: 1.- Refrigerating apparatus comprising a compressor, condensing means having two condensing passages in parallel circuit relation and discharging into a common space, one passage being arranged to permit the entrance of, liquid thereinto' and the other being arrangedto prevent the entrance of liquid thereinto.

2. Refrigerating apparatus comprising in combination a compressor and a pair of condensers connected in parallel circuit relation with the compressor discharging into a common space, and arranged to permit the en'- trance of liquid into one condenser and to prevent the entrance of liquid into the other condenser.

3. Refrigerating apparatus comprising in combination a compressor, a conduit for receiving liquid refrigerant, and condensing means having two condensing passages connected in parallel between the compressor and the conduit, the connections being arranged to permit the entrance of liquid from the compressor into one passage and to prevent the entrance of liquid into the other passa e.

Z. Refrigerating apparatus comprising :1.

compressor, an Oll trap, a conduit for receiv- I ing both refrigerant and oil, a pair of condensers connected in parallel between the trap and the conduit, the trap being'adapted to permit oil to flow to one condenser and to prevent oil from flowing to the other condenser.

5. Refrigerating apparatus comprising in combination a compressor, condensing means including two condensing conduits in parallel circuit relation and discharging into a common space, and means between the compressor and condenser for preventing liquid delivered by the compressor from entering one of the condensing conduits, said means permitting liquid to enter the other conduit.

6. Refrigerating apparatus comprising in combination a compressor, condensing means including two condensing conduits in parallel circuit relation and discharging into a common space, and means between the compressor and condenser for preventing liquid delivered by the compressor from entering one of the condensing conduitssaid means permitting both liquid and gas to enter the other conduit.

7. Refrigeratingapparatus comprising in combination a compressor, condensing means including two condensing conduits in parallel circuit relation and discharging into a common space, and gas and liquid separating means connected between the compressor and condenser conduits and disposed above the level of the conduits, said separating means preventing liquid from entering one conduit and permitting gas to enter said conduit freely at all times and permitting the flow of liquid by gravity to the other conduit.

In testimony whereof I hereto affix my signature.

GEORGE M. TROUP. 

